Addition and supplement method of reservoir stratum protective solid-phase material of deep well drilling fluid based on solid phase particle size degradation

Abstract

The invention relates to an addition and supplement method of a reservoir stratum protective solid-phase material of a deep well drilling fluid based on solid phase particle size degradation. A deep or ultradeep well has obvious phenomenon of solid-phase particle size degradation due to extremely complex drilling fluid conditions, however, a classic solid phase particle size distribution optimization theory does not fully consider the solid-phase particle size degradation. According to the method, influence of time on the solid phase particle size degradation degree under the reservoir stratumcondition is simulated indoor, particle size degradation is considered on the basis of solid phase particle size distribution suitable for the reservoir stratum, the formulation proportion of particles of large particle size is appropriately increased, and when the optimized solid-phase particles are circulated to the reservoir stratum, the particle size distribution of the optimized solid-phaseparticles match the pore throat size or crack width of the reservoir stratum. In the circulation process of the drilling fluid, proper time for supplementing the material is determined, so that the solid-phase particle size distribution in the drilling fluid is always suitable for the reservoir stratum. The method can provide basis for design of the material particle size distribution and materialaddition and supplement under solid=phase particle size degradation.

Description

technical field [0001] The invention relates to the field of reservoir protection and drilling fluid technology in the drilling and completion process of the oil and natural gas industry. This method aims at the phenomenon of particle size degradation of the solid phase in the deep drilling process, and proposes a supplementary method for solid phase materials in the drilling fluid, which is used for optimizing the design of reservoirs. Provide a basis for protecting the particle size distribution of solid phase materials. Background technique [0002] With the development and utilization of oil and natural gas resources, the direction of oil and natural gas exploration has gradually shifted from shallow to deep, and the complex downhole conditions have gradually increased, such as high temperature and high pressure, which put forward higher requirements for reservoir protection and working fluid loss control. However, choosing the appropriate shielding temporary plugging gr...

AI Technical Summary

Problems solved by technology

On-site construction usually supplements solid-phase materials based on experience, and the particle size distribution and optimal timing of supplementary materials cannot be well grasped

Because the particle size distribution of the solid phase in the drilling fluid is not well controlled, the matching between the particle size distribution and the reservoir fracture width or pore throat distribution is reduced, which directly results in the loss of drilling fluid, eventually causing reservoir damage and increasing drilling non-production time

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